This looks very clear, nicely done. These are certainly examples I
will link to for other GLAMs with concerns about how to make
declarations.
For NARA employees that are active on Wikimedia projects (by some
reasonable measure of "active") it would be handy if you were able to
publish a survey of their on-wiki experiences after making a statement
this way on their user pages.
Fae
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faewik(a)gmail.com
https://commons.wikimedia.org/wiki/User:Fae